Thanks, Jeremy. For future reference, would you mind showing how that subfilter could be used to test for the existence of a particular variable or macro, say 'VAR_NAME', and display the text "Undefined variable or macro 'VAR_NAME'" if it is not found.
-David On Monday, 25 February 2019 22:39:23 UTC+9:30, Jeremy Ruston wrote: > > Hi David > > I think you’re right: there is no way to test for the existence of a > variable whose value is blank. I’ve added an [is[variable]] subfilter > operator for v5.1.20 to address this: > > > https://github.com/Jermolene/TiddlyWiki5/commit/36e76429b1a1d4638374d513430393db5693b932 > > Best wishes > > Jeremy. > > > On 25 Feb 2019, at 12:34, David Nebauer <davidn...@gmail.com <javascript:>> > wrote: > > As I understand it, if you attempt to call an undefined macro the call > fails silently, with nothing displaying in the tiddler to alert users. This > occurs regardless of the calling method, i.e., > > <<not-a-real-macro>> > or > <$macrocall $name="not-a-real-macro"/> > > *Is there a technique for checking whether a macro is defined, and > displaying a message in the tiddler if the macro is not defined?* > > Ideally, the test would not just check for *output* from the macro, since > there might be valid circumstances where a macro produces no output. > > -David > > -- > You received this message because you are subscribed to the Google Groups > "TiddlyWiki" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to tiddlywiki+...@googlegroups.com <javascript:>. > To post to this group, send email to tiddl...@googlegroups.com > <javascript:>. > Visit this group at https://groups.google.com/group/tiddlywiki. > To view this discussion on the web visit > https://groups.google.com/d/msgid/tiddlywiki/1ecc0c93-5932-41bb-9634-3eca9daf26c1%40googlegroups.com > > <https://groups.google.com/d/msgid/tiddlywiki/1ecc0c93-5932-41bb-9634-3eca9daf26c1%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > > > -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to tiddlywiki+unsubscr...@googlegroups.com. To post to this group, send email to tiddlywiki@googlegroups.com. Visit this group at https://groups.google.com/group/tiddlywiki. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/49d883c4-f2f7-434b-aaf7-5b1f0d21a29b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
